Smalltalk: Formatting single-quote-character is not a string

Which source-formatting library does Exercism currently use?
The Smalltalk formatter has an error handling string-quote-character definition... `$'`
It is treating it as a start-string-indicator and formatting all subsequent text as a string,
when really the dollar-sign acts similar to blackslash-escape to define the character itself.

Line 23-24 here is an example...
https://exercism.io/mentor/solutions/0db14c4c5111427ab0afd311b2ae4fa7
Line 24 should not be green.

I'll follow up the formatting-library if you can point me in the right direction.